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Themes

Moby-Dick is a symbolic work, but also includes chapters on natural history. Major themes include obsession, religion, idealism versus pragmatism, revenge, racism, sanity, hierarchical relationships, and politics. All of the members of the crew have biblical-sounding, improbable, or descriptive names, and the narrator deliberately avoids specifying the exact time of the events (such as the giant fish disappearing into the dark abyss of the ocean) and some other similar details. These together suggest that the narrator — and not just Melville — is deliberately casting his tale in an epic and allegorical mode.

The white whale has also been seen as a symbol for many things, including nature and those elements of life that are out of human control.^{Ch 42} The character Gabriel, "in his gibbering insanity, pronounc[ed] the White Whale to be no less a being than the Shaker God incarnated; the Shakers receiving the Bible."^[14]. Melville mentions the Matsya Avatar of Lord Vishnu, the first among ten incarnations when Vishnu appears as a giant fish on Earth and saves creation from the flood of destruction. Melville mentions this while discussing the spiritual and mystical aspects of the sailing profession and he calls Lord Vishnu as the first among whales and the God of whalers.

The Pequod's quest to hunt down Moby Dick itself is also widely viewed as allegorical. To Ahab, killing the whale becomes the ultimate goal in his life, and this observation can also be expanded allegorically so that the whale represents everyone's goals. Furthermore, his vengeance against the whale is analogous to man's struggle against fate. The only escape from Ahab's vision is seen through the Pequod's occasional encounters, called gams, with other ships. Readers could consider what exactly Ahab will do if he, in fact, succeeds in his quest: having accomplished his ultimate goal, what else is there left for him to do? Similarly, Melville may be implying that people in general need something to reach for in life, or that such a goal can destroy one if allowed to overtake all other concerns. Some such things are hinted at early on in the book, when the main character, Ishmael, is sharing a cold bed with his newfound friend, Queequeg:

... truly to enjoy bodily warmth, some small part of you must be cold, for there is no quality in this world that is not what it is merely by contrast. Nothing exists in itself. If you flatter yourself that you are all over comfortable, and have been so a long time, then you cannot be said to be comfortable any more.
— Moby-Dick, Ch. 11[4]

Ahab's pipe is widely looked upon as the riddance of happiness in Ahab's life. By throwing the pipe overboard, Ahab signifies that he no longer can enjoy simple pleasures in life; instead, he dedicates his entire life to the pursuit of his obsession, the killing of the white whale, Moby Dick. A number of biblical themes can also be found in the novel. The book contains multiple implicit and explicit allusions to the story of Jonah, in addition to the use of certain biblical names (see below).

Ishmael's musings also allude to themes common among the American Transcendentalists and parallel certain themes in European Romanticism and the philosophy of Hegel. In the poetry of Whitman and the prose writings of Emerson and Thoreau, a ship at sea is sometimes a metaphor for the soul.